Safety device for elevators



Feb. 21, 1928. 1,660,064

w. BELLOWONS ET AL SAFETY DEVICE FOR ELEVATORS Filed March 8. 1926 gwuwntoz W fielionons 11? F1 z/mrria,

Patented Feb. 21, 1928.

WILLIAM BnLLowons AND YIEAUL RICHARDS, or PLYMOUTH, "rnNNsYLvAnra SAFETY DEVICE FOR ELEVATORS.

Application filed March 8, 1926. Serial No. 93,249.

This invention relates to safety devices for elevators, and has for one of its ob]ects the provision of a novel, simple and highly efficient device of this character which shall I be adapted for use in connection with pas-- senger, freight and mine elevators and which shall embody a pair of crossed levers pivoted intermediate their ends to the elevator cage and provided with angular lower ends and having the hoisting cable secured to their upper ends, and a spring positioned between the levers and adapted on the breakage of the hoisting cable to actuate thelevers so as to carry and hold their lower'angular ends into such contact with the guides as to hold the elevator cage against movement.

The invention is hereinafter fully described and claimed, and illustrated in the accompanying drawing, wherein:

Figure 1 is a sectional view taken on a plane extending vertically and centrally through an elevator cage equipped with a safety device constructed in accordance with our invention,

Figure 2 is a horizontal sectional view taken on the plane indicated by the line 2-2 of Figure 1, and

Figure 3 is a vertical sectional view taken on the plane indicated by the line 3-3 of Figure 2.

Corresponding and like parts are referred to in the following description, and designated in the several views ofthe accompanying drawing, by similar reference characters.

In the drawing 1 designates the guides, 2 the cage and 3 the hoisting cable of an elevator. The cage 2 is provided in its lateral sides with grooves 4. for the reception of the guides 1, and is steadied in its movement by lower shoes 5 and upper shoes 6 which are of U-form in horizontal section and are secured within the grooves 4 and embrace the guides 1. All of these parts are of well known construction.

In accordance with the present invention the lateral sides of the cage 2 are provided adjacent the upper shoes 6 with openings 7. A horizontal shaft 8 is mounted on the cage 2 adjacent the upper end thereof, and extends from the front to the rear thereof. It is located in the center of the cage 2 and is journaled at its ends in bearings 9. Crossed levers 10 are pivoted intermediate their ends on the shaft 8, and are provided at their upper ends with vertical extensions 11 and have their lower ends bent upwardly and outwardly to provide brake shoes 12. The

cable 3 is secured to the lever extensions 11 by a ring 13 to which the cable is directly secured, chains 14: secured to the ring, and

yokes 15 pivoted as at 16 to the lever extensions and having the chains secured thereto. An expansion coil spring 17 is positioned be tween the levers 10 below the shaft 8, and is retained in place by studs 18 projecting from the inner sides of the levers and extending into the ends of the spring. The levers 10 are positioned upon the shaft 8 centrally between the ends of the latter, and are held in place by elements 19 passing through the shaft and washers 20 positioned on the shaft between the levers and elements.

The cage 2 is supported from the cable 3 through the medium of the levers 10, and the Weight of the cage holds the levers in the position indicated by solid lines in Figure 1. When the levers 10 are in this their normal position, the spring 17 is under tension and the brake shoes 12 areoutof contact with the guides 1. The brake shoes 12 will be on the breakage of the cable 3, forced by the spring 17 outwardly through the openings 7 into engagement with the inner or opposing sides of the guides 1, as shown by dotted lines in Figure 1. The brake shoes 12 extend upwardly and outwardly from the levers 10 and are tapered and have their outer or active faces roughened. When in active position the brake shoes 12 engage the guides 1 at points within. the upper shoes 6. As the brake shoes 12 are rigid with the levers 10 they will be held in firm engagement with the guides 1 and the greater the weight of the cage the firmer this engagement.

It should be understood that the drawing is merely illustrative and does not pretend to give exact proportions. Furthermore, the said drawing is illustrative of a preferred construction, it being'our expectation that various changes and modifications may be made without departing from the spirit,

and scope of our invention. I

What is claimed is A safety device for elevators comprising, in combination with a cage and guides and a hoistingcable for the cage, the cage being provided in its lateral sides with openings, crossed levers constituting the sole means for connecting the cage to the cable and provided at their upper ends with vertical extensions and at their lower ends Withbrake shoes formed integrally therewith and extending upwardly and laterally therefrom, means pivoting the levers together and.

to the cage withtheir lower portions or ranged Within the cage and the brakeshoes tioned between anel carri-ed bythe levers below their" pivot and adapted on'th'e break-- age of the cable to move the brake shoes into contact With the guides p In testimony whereof We" affiX'ouf signatures.

WILLIAM BELLOVVONS. PAUL RICHARDS. 

